| 120 | x | × | 30 100 | + | 10 100 | = | 20 100 | ( | x | + | 120 | ) |
| 方程左边 = | 36 | x | + | 10 100 |
| 36 | x | + | 10 100 | = | 20 100 | ( | x | + | 120 | ) |
| 方程右边 = | 20 100 | x | + | 20 100 | × | 120 |
| = | 20 100 | x | + | 24 |
| 36 | x | + | 10 100 | = | 20 100 | x | + | 24 |
| 36 | x | − | 20 100 | x | = | 24 | − | 10 100 |
179 5 | x | = | 24 | − | 10 100 |
179 5 | x | = | 239 10 |
| x | = | 239 10 | ÷ | 179 5 |
| = | 239 10 | × | 5 179 |
| = | 239 2 | × | 1 179 |
| x | = | 239 358 |
| x | = | 0.667598 |